Skip to contentSkip to navigation

Specialist Advice — 18 minutes

True or False: Ten statements about STBBIs

March 17, 2026

Raymond Lepage, PhD, Doctor in Biochemistry
Raymond Lepage, PhD, Doctor in Biochemistry
Science popularizer

Over the years, it has become clear that even well-informed people have certain opinions about STBBI transmission, infection, testing and treatment that are not always well founded. We consulted the medical literature to verify ten of the most common assumptions. STDI

If I have no symptoms several weeks after having an unprotected sexual relation, I don’t need to get tested.

FALSE

Many people infected with an STBBI may have few or no symptoms or signs of infection, even several weeks after having unprotected sex. Therefore, screening tests remain essential to confirm that you are not infected or that any previous infections have been effectively cured. Depending on the disease, tested can be carried out on urine, blood, vaginal or anal discharge or other samples (urethra, throat, eyes and ears).

There are many risk factors and situations that justify the need for testing, even if the sexual partners have no signs or symptoms of an STBBI:

  • Unprotected sex 
  • Sharing equipment used for injecting or inhaling drugs 
  • Tattooing or body piercing with unsterilized equipment 
  • Exposure to contaminated biological fluids, including sex toys contaminated with semen or vaginal secretions 
  • Discontinued use of condoms or dental dams by couples in a stable relationship 
  • Pregnancy 
  • Sexual relations that you or your partner have had with a new partner, several partners or a partner with an STBBI

According to the Public Health Agency of Canada, the population groups most affected by STBBIs should be tested regularly. [1] Here are the risk factors:

  • Multiple partners (simultaneously or over time)
  • Anonymous or casual sexual partners
  • Sexual relations without the use of a barrier method
  • Sexual relations with people with an STBBI
  • A history of STBBIs
  • Substance use (i.e., drugs, alcohol or both)
  • Use of erectile dysfunction medications
  • A history of intimate partner violence or sexual abuse
  • Social environments (e.g., saunas, circuit parties, post-secondary institutions)

The timing of the test is an important aspect of STBBI screening. No test will be positive the day after infection. In some cases, it may take 10 days for a syphilis infection to be detected. The end of the window period during which this infection can remain undetectable can extend up to 12 weeks, as is the case for hepatitis B, hepatitis C and HIV. The window period for chlamydia and gonorrhea is shorter, at around 14 days. In the event of an initial negative result, most of these tests need to be repeated to ensure that infection can truly be ruled out. As technology evolves rapidly, these timeframes need to be reviewed regularly. [2,3]

A Pap test is not a screening test for STBBIs. It merely checks for the presence of cervical lesions caused by the human papillomavirus (HPV).

Learn more about sexually transmitted and blood-borne infections.

I have been successfully treated for an STBBI. I acquired lifelong protection.

False, except in some cases

In an immunocompetent person, lifelong protection can only be obtained for infections that can be prevented by successful vaccination, such as HPV and hepatitis A or B. Chlamydia, gonorrhea and syphilis do not elicit a sufficient immune response from the body, so people can be infected repeatedly. Infection with the herpes virus lasts a lifetime. In rare cases, people undergoing effective treatment for HIV may become infected with another type of drug-resistant HIV.

Chlamydia and gonorrhea can be successfully treated.

Increasingly less accurate for gonorrhea

Chlamydia can be effectively treated with antibiotics such as doxycycline (a tetracycline) and azithromycin (a macrolide), which block bacterial growth. However, the situation is more concerning for gonorrhea. Over the decades, the bacteria responsible have developed resistance to several antibiotics: first penicillin, then tetracyclines, macrolides and quinolones. Today, cephalosporins are among the last effective options. New resistant strains are also beginning to appear [4]. As a result, this infection is becoming increasingly difficult to treat. While awaiting new treatments, physicians use different combinations of antibiotics to try to control the infection.

Syphilis is an old disease, now rarely observed in Canada

FALSE

Syphilis is indeed a very old sexually transmitted disease. The rate observed in Canada was very low until 2001, when it began to rise, particularly among men and more recently among heterosexual women. From 2018 to 2023, the global syphilis infection rate doubled from 6,371 cases to over 12,000. During the same period, the number of newborns with neonatal syphilis tripled. [5]

In Canada, I can be held criminally responsible if I have sex without disclosing that I have an STBBI.

TRUE... for HIV

In Canada, it is a crime not to disclose, before having sex, that you have HIV, which poses a “significant risk of serious bodily harm.” The person is usually charged with aggravated sexual assault, one of the most serious offences in the Criminal Code, carrying a maximum sentence of life imprisonment and the mandatory designation of sex offender. [6]

So far, most legal proceedings have involved HIV, and virtually none concern herpes, syphilis, chlamydia or other STBBIs. You can, however, be sued in civil court, including small claims court, for failing to report an STBBI other than HIV (sections 7 and 1457 of the Civil Code).

With oral sex, there is no chance of catching an STBBI.

FALSE

Although it is not the most frequent source of transmission, it is entirely possible to catch an STBBI during unprotected oral sex, with or without orgasm or ejaculation. During fellatio, the risk of contracting herpes and syphilis is high, but lower for HIV, chlamydia, gonorrhea and HPV.

The risks are about the same during cunnilingus and are increased for HIV, hepatitis B and hepatitis C if there is blood in the vaginal secretions. [7]

Further reading: What is an STBBI and how is it transmitted?

You can catch an STBBI from a toilet seat.

FALSE

The viruses and bacteria that cause STBBIs can only survive very briefly on surfaces such as a toilet seat, and it is highly unlikely that they will still be alive when the next person uses it. What’s more, contact with the germ would have to occur between the toilet seat and a very specific part of the body with an open wound. Therefore, for all intents and purposes, transmission is impossible. [8]

Showering after sex eliminates all chances of contracting an STBBI.

FALSE

Washing with mild soap and water after sex is an acceptable hygiene measure but does not protect against STBBIs. However, urinating can eliminate some of the micro-organisms at the exit of the urethra (the tube through which urine is expelled), thereby preventing urinary infections. In particular, vaginal douches should be avoided as they can irritate the vaginal mucosa or push micro-organisms further into the vagina. [9]

Talking about responsible sexual behaviour with teenagers encourages them to discover sexual pleasures more quickly.

FALSE

On the contrary, according to the World Health Organization (WHO), “there is ample evidence that quality sex education produces positive health outcomes with benefits that last throughout a person’s life. Young people are more likely to delay the start of their sexual activity – and when they do have sex, to have safe sex – if they are better informed about their sexuality, sexual health and rights. [11]”

Teenagers are very exposed to sexuality through the internet and social networks. Some of the messages conveyed are true, others, patently false. Limiting themselves to this exposure does not give them all the information they need and puts them at greater risk of infection.

Read more: How to speak about sexuality with your teenagers

Human papillomavirus (HPV) only affects women.

FALSE

HPV infections are also very common among men. According to the World Health Organization (WHO), one in three men over the age of 15 carries at least one type of the virus, and one in five carries a high-risk cancer-causing type [11].

Most HPV infections are asymptomatic and clear on their own within two years. However, some persist longer. In men, the virus is transmitted through skin-to-skin contact with an infected area during vaginal, anal, or oral sex, or even without sexual intercourse. The presence of genital warts (condylomas) in the anogenital region increases the risk of transmission, even though they are not always visible [12].

Treatments exist for condylomas, but none can completely eliminate the virus. Vaccination remains the most effective form of protection. It is offered starting in grade 4 of elementary school to both girls and boys.

Join the Biron community

Receive educational content, tips, and offers on health and wellness.

When you need professional support, we're here to help

We offer STBBI screening with results in 24 hours or less for chlamydia, gonorrhoea, syphilis, hepatitis B, and HIV.

Sources12
  1. Agence de la santé publique du Canada. Guide de prévention des Infections Transmissibles Sexuellement et par le Sang (ITSS). https://www.canada.ca/fr/sante-publique/services/maladies-infectieuses/sante-sexuelle-infections-transmissibles-sexuellement/lignes-directrices-canadiennes/guide-prevention-itss.html. Consulté le 12 février 2026.
  2. MSSS. Syphilis, hépatites B et C, VIH. Prélèvements et analyses recommandés chez une personne asymptomatique. https://publications.msss.gouv.qc.ca/msss/fichiers/2019/19-308-11W.pdf. Consulté le 12 février 2026.
  3. MSSS. Infections à Chlamydia Trachomatis, ou à Neisseria gonorrhoeae. Prélèvements et analyses recommandés chez une personne asymptomatique. https://publications.msss.gouv.qc.ca/msss/fichiers/2019/19-308-10W.pdf. Consulté le 12 février 2026.
  4. Center for Disease Control (CDC). “Drug Resistant Gonorrhea”. https://www.cdc.gov/gonorrhea/hcp/drug-resistant/index.html. Consulté le 12 février 2026.
  5. Gouvernement du Canada. « Les cas de syphilis sont en hausse au Canada ». https://www.canada.ca/fr/services/sante/campagnes/syphilis.html. Consulté le 12 février 2026.
  6. CliquezJustice.ca. Les infections transmises sexuellement : devez-vous informer votre partenaire? https://cliquezjustice.ca/vos-droits/les-infections-transmises-sexuellement-devez-vous-informer-votre-partenaire. Consulté le 12 février 2026.
  7. INSPQ. Estimation du risque associé aux activités sexuelles. https://www.inspq.qc.ca/sites/default/files/documents/formation/itss/7-DepistageITSS_RisquesSelonActiviteSexuelle.pdf. Consulté le 12 février 2026.
  8. Hackensack Meridian Health. “Can you get an STD from ahttps://www.hackensackmeridianhealth.org/en/healthu/2024/01/29/can-you-get-an-std-from-a-toilet-seat#: Consulté le 12 février 2026.
  9. Office of Women’s Health (US). Douching. https://womenshealth.gov/a-ztopics/douching#:~:text=No%2C%20you%20should%20not%20douche,prevent%20HIV%20and%20unwanted%20pregnancy. Consulté le 12 février 2026.
  10. Organisation mondiale de la santé (OMS). Éducation complète à la sexualité. https://www.who.int/fr/news-room/questions-and-answers/item/comprehensive-sexuality-education. Consulté le 12 février 2026.
  11. Organisation mondiale de la santé (OMS). One in three men worldwide are infected with genital human papillomavirus. https://www.who.int/news/item/01-09-2023-one-in-three-men-worldwide-are-infected-with-genital-human-papillomavirus. Consulté le 12 février 2026.
  12. Santé Canada. Le virus du papillome humain (VPH) et les hommes. https://www.canada.ca/fr/sante-publique/services/maladies-infectieuses/sante-sexuelle-infections-transmissibles-sexuellement/vph-hommes-questions-reponses. l/1000?wbdisable=true. Consulté le 12 février 2026.
Raymond Lepage, PhD, Doctor in Biochemistry
Raymond Lepage, PhD, Doctor in Biochemistry
Science popularizer
For about 50 years, Raymond Lepage worked as a clinical biochemist in charge of public and private laboratories. An associate clinical professor at the Faculty of Medicine of the Université de Montréal and an associate professor at the Université de Sherbrooke, he has also been a consultant, researcher, legal expert and conference speaker. He has authored or co-authored more than 100 publications for scientific conferences and journals, and now devotes part of his semi-retirement to popularizing science.